The SN74HC42DR is a high-speed CMOS integrated circuit (IC) component manufactured by Texas Instruments. It is a BCD (Binary Coded Decimal) to Decimal Decoder that converts a four-bit BCD input to its corresponding decimal value. Here is an overview and some key features of the SN74HC42DR:
1. Input and Output Pins:
- BCD Inputs (A, B, C, D): Four input pins that accept a binary-coded decimal value (inputs A, B, C, and D represent bits 1, 2, 4, and 8, respectively).
- Enable (G): Active LOW input pin that enables the decoder when the signal is low.
- Decimal Outputs (0-9): Each of the ten output pins represents a decimal value from 0 to 9.
2. Decoder Functionality:
- The SN74HC42DR decodes the four-bit BCD input and activates the corresponding decimal output pin.
- For example, if the BCD input is "0001" (decimal value 1), the output pin "1" will be activated while the other output pins remain inactive.
3. Active LOW Enable:
- The decoder is enabled when the Enable (G) pin receives a logic LOW signal (0V).
- When the Enable pin is HIGH (greater than 2V), all output pins are in a high-impedance state
